#1
Which of the following is NOT a common refrigerant used in refrigeration systems?
#2
What is the purpose of a condenser in a refrigeration system?
To absorb heat from the refrigerated space
To regulate the flow of refrigerant
To compress the refrigerant
To reject heat to the surroundings
#3
What is the primary function of the expansion valve in a refrigeration system?
To increase the pressure of the refrigerant
To control the flow of refrigerant into the evaporator
To regulate the temperature of the refrigerant
To condense the refrigerant
#4
What is the purpose of the compressor in a refrigeration system?
To absorb heat from the refrigerated space
To regulate the flow of refrigerant
To compress the refrigerant
To reject heat to the surroundings
#5
What is the function of a heat exchanger in a refrigeration system?
To absorb heat from the refrigerated space
To reject heat to the surroundings
To regulate the flow of refrigerant
To transfer heat between two fluids
#6
What is the purpose of an evaporator in a refrigeration system?
To compress the refrigerant
To condense the refrigerant
To absorb heat from the refrigerated space
To regulate the flow of refrigerant
#7
Which of the following is a common cause of refrigerant leaks in a system?
High system pressure
Improper installation
Low ambient temperature
Regular maintenance
#8
What is superheat in a refrigeration system?
The difference between the actual refrigerant temperature and its saturation temperature
The amount of heat required to change a substance from a liquid to a vapor
The temperature at which a refrigerant changes from a vapor to a liquid
The pressure exerted by the refrigerant vapor in the system
#9
Why is it important to maintain proper lubrication in a refrigeration system?
To reduce the system's energy consumption
To prevent compressor failure and wear
To increase the refrigerant's heat transfer efficiency
To regulate the system's pressure
#10
Which of the following is a common method for leak detection in a refrigeration system?
Visual inspection
Listening for hissing sounds
Using a magnet
Checking the oil level in the compressor
#11
What is the typical temperature range for a walk-in cooler in a commercial refrigeration system?
Below -10°C
0°C to 4°C
10°C to 15°C
Above 20°C
#12
Which of the following is a potential consequence of refrigerant leaks?
Decreased energy consumption
Increased system efficiency
Environmental damage
Improved cooling performance
#13
What is the function of a sight glass in a refrigeration system?
To indicate the pressure of the refrigerant
To monitor the temperature of the refrigerant
To detect refrigerant leaks
To observe the flow of refrigerant
#14
Which of the following is a recommended method for leak prevention in a refrigeration system?
Regularly checking and replacing the compressor
Using a UV dye in the refrigerant
Allowing refrigerant levels to drop before refilling
Increasing the system pressure
#15
Which refrigerant classification poses the highest risk to the ozone layer?
#16
What is the purpose of a filter-drier in a refrigeration system?
To regulate the flow of refrigerant
To absorb moisture and trap debris
To increase the system's cooling capacity
To monitor the temperature and pressure
#17
Why is it important to maintain proper airflow in the condenser of a refrigeration system?
To increase the system's cooling capacity
To prevent compressor overheating
To reduce the refrigerant pressure
To regulate the expansion valve
#18
Which refrigerant has been widely adopted as a replacement for R-22 due to its lower environmental impact?
#19
Why is it essential to evacuate air from the refrigeration system during servicing?
To reduce system pressure
To prevent compressor overheating
To prevent moisture contamination
To increase refrigerant efficiency